Using latest Nightly: Do a tools reload with non built in tools loaded. Now open inspector and do any mouse movement on the page. The following error is thrown : TypeError: source is not an object @ resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/util/object.js:43 There are many causes of this exception: 1) move your mouse, thus the handleMouseMove method in highlighter.js throws. 2) On panel load in inspector-panel.js 3) There can be more as this can be an in general thing, not specific to inspector.
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